Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4d41281c016b5a…

MALICIOUS

PDF

75.2 KB Created: 2021-03-04 23:48:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2cad2af20672264fed543425db7032bf SHA-1: 7c81232214b45a17f214f101ba30bf4de7ea11de SHA-256: bb4d41281c016b5ad897c793c3e782dc5604d29f8d6292afd5ce6bf9496130b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It contains numerous external URLs, with one specifically noted as a redirector for 'ccna study guide 2017 pdf', suggesting a phishing or scam lure. The PDF structure and embedded links point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/strik?utm_term=ccna+study+guide+2017+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403954/normal_5fe27ca8453c4.pdfIn PDF document text
    • http://nusururak.22web.org/plastic_deformation_cortical_bone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_603728e61032c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478148/normal_6035603ded3a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_60271effefc4f.pdfIn PDF document text
    • http://dimoduves.22web.org/anaganaga_oka_roju_video_song.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_a2221f68bf4145b39ac2fa25f6a0e7c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6385d6f-ffa9-4c77-915c-fff7ece748f7/words_that_start_with_n_to_describe_someone_in_a_good_way.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_406f229167804f39a5c24f0657f6b51b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/577d1890-559a-4ab0-8bbd-45f3186df025/sikufepipujofi.pdfIn PDF document text
    • http://bidilud.rf.gd/tajid.pdfIn PDF document text
    • http://vikogen.epizy.com/vscode_format_code_css.pdfIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_ca2e32cdac444cc09cde1552c36ab96e.pdf?index=trueIn PDF document text
    • http://luzadewo.epizy.com/83963391248.pdfIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_5e3ba52506c0475f89db5a6f963073fd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd0e8489-0d91-4b39-a4f9-31106b6e890a/what_is_another_word_for_lack_of_self_confidence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15855222-c91d-45f1-b86e-76471c8d3b33/epson_730hd_bulb.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_ffb0eeabf19446ebb7cbd602f4b3fba6.pdf?index=trueIn PDF document text
    • http://bagozorox.rf.gd/avensis_verso_repair_manual.pdfIn PDF document text
    • http://palipesokugukux.epizy.com/arduino_uno_simulator_software_free.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 5608 bytes
SHA-256: c4d1a54658ffd187fa816ca763cd97386444c3b47ffee64c5284f979b6088e66
font_01_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 10644 bytes
SHA-256: aed137b862500f43e9cf5d31681ad51e854d1e99b1d2eb2e02c48d34667ccfbd

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